We've been using a Keuring at home, work, and when RVing. We bought a smaller single cup version, which takes up little room. I tested mine with a Kill-A-Watt meter as well, here's what I measured.
We bought the optional carry bag, which has enough room for the coffee pot and a box of coffee pods. Unlike the full sized model, it does not have a water reservior. Pour a cup of cold water in the top, put in the coffee (tea, or even hot chocolate) pod, push the button. A minute and a half later, it's done. Unplug it, no parasitic load. Total power to brew a cup, 0.02 KWH, or 20 WH. 20 WH / 12V = 1.67 AH. This works fine from an inverter.
My wife would take it from work to bring camping each time we'd go. When we bought the Class A, we bought a dedicated coffee maker for it. The new version is even smaller than the previous one, and has cord storage in the back. It fits nicely in a pantry drawer.
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